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1、2023-2024山东省高一英语试题
2、山东省2024年高一全省联考
3、2024年山东高一联考
4、山东省2023-2024学年高一下学期质量监测联合调考
5、山东省高一联考试题2024
6、山东省高一联考时间2024
7、2024山东省高三开学质量检测英语
8、2023-2024山东省高一下学期期末英语
9、2024年山东省高一联考
10、山东省2024高三开学质量检测英语

permanence has often been owed to the use of volcanic ash.But this time the researchers focusedtheir attention on another component of the ancient concrete mix-small white lime pieces."These are not found in modern concrete,so why are they present in these ancientmaterials?"asked professor Admir Masic,from US.The research team said the lime pieces hadbeen thought to be the result 'of "careless mixing"or poor-quality raw materials.But they were infact what gave the ancient concrete a "previously unrecognised self-curing capability".Tiny gaps in the concrete would tend to travel through the high-surface-area lime pieces and,when exposed to water,would form calcium:carbonate(碳酸钙)，filling the gaps almost likeglue."These reactions take place naturally and therefore fill the gaps before they spread,"saidthe researchers,who conducted tests using modern concrete and the ancient way.The Romans began using concrete in the 3rd century BC.It helped them build manystructures including temples and bridges.The Pantheon,dating back to the 2nd century AD,is around concrete building with the world's largest and oldest unreinforced(无钢筋的)concreteround roof.The massive Roman Colosseum,dating to the first century AD,also would havebeen impossible without concrete."The Romans were great engineers.The fact that we can stillwalk around many of their structures is a proof to that,said the study lead author LindaSeymour.Professor Masic said he hoped the findings could be used to improve the concrete beingused today."This is an important next step in improving the sustainability of modern concretesthrough a Roman-inspired strategy,"he said.11.Why can the ancient Roman buildings remain standing?A.Their concrete contained small lime pieces.B.Volcanic ash was rarely used in the buildings.C.Romans used special water to make the concrete.D.Mysterious ways were taken to build the structures.12.Why did researchers previously ignore the small lime pieees?A.The pieces are very common in all concrete.B.They thought the pieces were put in carelessly.C.They thought volcanic ash was the key to concrete.D.The small pieces showed the concrete was of poor quality.13.How did the ancient concrete cure itself?A.Water kept the concrete wet to fill the gaps.B.Volcanic ash produced glue to fill tiny gaps.C.Volcanic ash broke the tiny gaps in the concreteD.Lime pieces formed calcium carbonate and filled the gaps.【24·G3AB·英语（二十五）一R一必考-QG】